Water filter



FIG. 1 is a perspective left-side front elevational view of a water filter, showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a right-side view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a water filter, as shown and described. 